Pulverizer.



W. K. LIGGETT & W. J. ARMSTRONG. PULVBRIZER.

APPLICATION FILED JAN. 26, 1909. 1,041,495, PatentedOct. 15, 1912.

2 SHEETSSHEET W. K. LIGGETT & W. J. ARMSTRONG.

PULVBRIZER. APPLICATION FILED JAN. 20. 1909 Patented Oct. 15, 1912.

2 SHEETS-SHEET 2.

WILLIAM K. LIGGETT AND WALTER J1 ARMSTRONG, OF COLUMBUS, QHIO, ASSIGNOBS TO THE JEFFREY MANUFACTURING COMPANY.

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I specification of Letters Patent. I Patented Oct. 15, 19112.

Application filed January 23, 1909. Serial No. 474,319.

To all whom it may concern:

Be it known that we, WILLIAM K. Lrecnr'r, and WALTER J. ARMSTRONG, citizens of the United States, residing at Cohimb'us, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Pulverizers, of .which the following is a specification, reference being had therein to the accompanying drawings. This invention relates to pulverizers of the swing hammertjype, and has as its objectthe provision of an im rot-ed hammer mechanism which will be e cient to grind the material and possess great wearing qualities. In the-drawings Figure 1 is a view of a side elevation of the machine as a whole; Fig. 2 is a vertical crosssection taken along the line 22 of Fig. 1. tary view in longitudinal section illustrating the manner in which the "hammers; are mounted. Fig. 4 is'afra'gmentary cross sectional view showing the manner in which the hammers are mounted. 'Flg. -5 is a perspective view of the hammer block. Fig. 6 s ows the block pin. -Fig. 7 shows one .of the hammer bars.

In Figs 1 and 2 of the drawi a pulverizer casing and assem such as are illustrated and described and claimed in the applications of William K. Liggett, Serial No. 357,072, filed February 12, 1907, and Serial No. 467,702, filed De- -cember 15, 1908, and the frame parts,

- nism and disk mounting for the hammers are shown in this application merel for the purpose of illustration and may e of any efiland with vertical slots 5 extending updesired type and character.

The frame of the pulverizer consists of the side plates 1 and 2 and the end pieces 3, 3 to which the side plates are bolted; The end frame pieces 3, 3 are each provided with central apertures to receive the 'main shaft gitudinal displacement with respect to the Fig. 3 is fragmen is shown led parts breaker and grinding plates, feed mocha gitudinal displacement with-respect to the machine as a whole.

The cover plates'14 are bolted in place over-the'vertical slots 5 and-in this manner the end f the machine is completel' closed so that no'dust can-find its way out om the pulverizer chamber to the'exterior of the machine.

Upon the shaft andimmediately within the end frame pieces 3, 3 of the casing of the machine arekeyed the end'plates 31, 31.

These plates are provided with a circular series of o enings 32 therethrou h Land parallel to t e axis offthe'- shaft..- series ,of disk plates 33 are keyed to the shaft between the end plates 31, and each of these disks is perforated near its periphery at points 25, 25 corresponding with the perforations-32 in the end plates 31. The disks 33 and end plates 31 are assembled upon the shaft with these perforations in alinement from end to end of the machine, and by means of these perforations the rods 36 are mounted in series about the shaft 34 as a center. I The alternate rods of these series are preferably of-a larger diameter vention to doaway with the necessity for frequently replacing those hammers.

The hammer arms 27 are mounted in pairs uponthe rods 36, and spacing blocks 38are mounted between them; the disk lates 33, the hammer arms and spacing b ocks engaging each other laterally in the order shown in the drawings. Between the two arms of each pairof arms is mounted a hammer block 39. This hammer block is formed shaft, thus also securing the shaft from loni with three projections 40 arranged at angles 1 of degrees. The flat vertica Sides of the block are grooved'radially at 41, 41 each of the grooves extending outward from the center of the block between the adjacent projections 40. These grooves are of a depth at least equal to the thickness of the hammer arms 27, and of a width just sufiicient to receive the hammer arms. These blocks have the shape of right prisms, the flat vertical grooved sides of each block constituting the ends of the prism and the working faces 47, together with the recesses therebetween, both of which are. perpendicular to these endifaces, constituting the sides of the right prism. Since the ends of the prism are so near together, it is disk-like in character and the working faces 47 can be con- Zidered as the peripheral edge parts of the isk. -The pairs of hammer arms are perforated transversely at their outer ends and in the bearings 42 thus formed are placed the pins43 by which the'hammer blocks are carried. These pins are of a reduced diameter fora portion of their length at each end, and the shoulders 45 engage the fiat vertical faces of the hammer arms to prevent axial displacement of the pins. WVhen the arms are. assembled, they are brought together with the pin,'held in position, and

, the circular frame formed by the rods 36,

disk; plates 33, end plates 31, and shaft 34 serve to hold the pins 43 and the blocks 39 securely in position.

The hammer blocks 39 are prevented from turning about the pins 43 which support them by means of the shoulders 46 upon each side of each of the grooves 41, these shoulders engaging the longitudinal edges of the hammer arms. When the working face'or edge 47 of that one of the three projections 40 which is directed radially out-- ward with respect to the main shaft 34 has become worn to such an extent as to interfere with the proper operation of the pulverizer, the cotter pins 48, which hold the rods 36 in longitudinal position, are removed and each of the rods 36 is in turn moved lengthwise out of the machine the shaft being rotated until the rod comes opposite the slot 5 in the casing, from which the cover plate 14 has previously been taken away. The hammer arms are in this way disassembled and the blocks can be each given a 120 degree turn so as to present a new working face to the grinding concaves and screen bars. The parts are readily reassembled, and in this manner a rapid adjustment of the hammer blocks is made possible. As these hammer blocks, when used with some kinds of material, rapidly wear away to such a point that the material cannot be ground to the desired fineness, the time with some materials being as short as ten or twelve hours, it is apparent that this problem of the provision of a hammer block which shall have a plurality of working 1 plate 54.

faces and shall be firmly secured to the rotating frame and, at the same time, readily adjustable, is an important one.

Between the end frames 3, 3 of the machine are bolted the curved plates 50, 51, forming part of the upper casing of the machine. To each of these plates is secured the linings 52' of special hardened steel which serve as breaker platesfor the material. There is also bolted to the end frames 3, 3, the inclined plate 53 and topbreaker Material is fed to the opening 55 by means of the plate feeding mechanism indicated as a whole by the numeral 56. The grinding surfaces consist of the adjustable breaker plate 59 and the screen bar concaves 60 and 61.. We do not claim herein the subjectmatter ofa wearing block broadly in combination with a pivoted or movable hammer arm to which it is rigidly secured, ,or to an adjustable, wearing block so mounted, such subject-matter having been claimed in the application of William K. Liggett, Ser. No. 467,702. In practice it has been found that the particular form of hammer shown anddescribed in that application can be improved upon as to the manner in which the hammer arms are positioned relative to the wearing block. It has been found desirable to have the vertical faces of the wearing block which are in planes perpendicular to .the main shaft at least flush with or outside of the corresponding vertical faces of the hammer arms. Thus the metal of the hammer arms is protected from material which may find its way between the rows of hammers and come into violent contact with the hammer arms with the result of rapid deterioration of the hammer rods. The rods may become so worn away as to fail to hold the wearing blocks to position against the great centrifugal force acting upon the blocks. In the design of the bearing blocks and supporting arms, shown in this application, this defect has been obviated.

What we claim is:

1. In a pulverizer, the combination of a rotatable cylindrical frame disposed wit-h its axis horizontal, hammer arms pivotally mounted in the outer parts of said frame, and hammer blocks each secured to the arms and having a plurality of working faces, each of which is adapted to be directed radially outward in turn as the preceding face becomes worn, each block being formed with grooves on its two vertical end faces, each groove extending outward from the center of the block to a point on the periphery between two adjacent working faces and being adapted to receive the outer end of that one of the hammer arms to which the block is secured whereby the hammer arm is protected within the groove.

2. In a pulverizer, the combination ofa cured to the outer ends of the hammer rotatable cylindrical frame disposed with its axis horizontal, hammer arms pivotally mounted in the outer parts of said frame, horizontal pins eachcarried between-and by the outer ends ofea'ch two of said arms, and triangular rightprismatic hammer blocks,

the three peripheral sides of each prism acting by successive adjustment as working faces, each block being centeredaxially upon one of the pins and grooved radially upon its vertical end faces, each groove extending outward between two peripheral working faces to receive the outer ends of the two hammer arms so as tofix the block in position on the end'of the hammer arms and to directed radially outward.

4. In a. pulverizer, the combination of a cylindrical frame rotatable on its axis, hammer arms pivotally mounted in the outer parts of said frame and hammer blocks secured to the outer ends of the hammer arms,

each block being formed with parallelend faces in planes transverse to the frame axis and with peripheral faces perpendicularthereto and with peripheral recesses between each two peripheral faces.

5. In a pulverizer, the combination ofa cylindrical frame rotatable upon its axis, hammer arms pivotally mounted in the'outer parts of said frame, and hammer blocks searms, each block being formed with three working projections spaced 120 apartand adapted to be successively adjusted to extend radially outward, each projection having a facedirected circumferentially forward and another face directed radially outward.

- 6. In'a pulverizer, the combination of a lindrical series of rods .mounted in the frame parallel to the frame axis and sym metrically arranged about the frame axis, hammer arms, the inner ends of which are sleeved upon the rods,lspacing means on-the rods between the arms, locking means at one end of each rod for preventing sidewis e displacement of the hammer arms along the rods, the spacing means and the locking means serving to prevent displacementpf each and every one of the hammer arms cylindrical frame rotatable on itsaxis, a cyalong each rod, pins, each having reduced 7 ends and enlarged middle portion, the outer ends of the hammer arms being perforated to snugly receive the reduced ends of the pins which are thereby held against endwise displacement each between two hammer arms, hammer blocks perforated to snugly fit upon the enlarged middle portion of the said pins between the arms supporting the pins, a casing for the cylindrical frame hav- I mg an opening in the endthereof opposite a point in the circle of rotation of the said rods, and a removable cover for the opening,

the position of the opening'being such that the entirenumber of hammer arms and hammer blocks-carried thereby upon, each rod can be disassembled by the single operation of removing the rod through the uncovered opening, after the said-locking'means has been disengaged.

In testimony whereof .we a-fiix our signatures", in presence of two witnesses;

WILLIAMv K. "LIGGETT. WALTER J. ARMSTRONG.

Witnesses:

H. B. ALEXANDER, C. D. MILLER. 

